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- Question
The process of Gram staining is based on the ability of bacterial cell wall
Options- A. to retain the safranin dye
- B. to retain the crystal violet dye during solvent treatment.
- C. to retain part of both dyes
- D. none of above
- Correct Answer
- to retain the crystal violet dye during solvent treatment.
- 1. Cholera toxin is an A-B type toxin in which the B portions bind to a receptor on a host cell and the A portion enters the cell to cause
Options- A. ADP ribosylation of adenylate cyclase that stops production of cAMP
- B. ADP ribosylation of a G protein that locks it into an active form that stimulates adenylate cyclase to make cAMP
- C. cleavage of rRNA that results in disruption of ribosome function
- D. ADP ribosylation of guanylate cyclase that stimulates production of cGMP Discuss
- 2. The "A" subunit of diphtheria toxin
Options- A. binds host cell receptors found on heart cells
- B. cause ADP ribosylation of a factor involved in protein synthesis
- C. forms cAMP that leads to fluid accumulation
- D. lysis macrophages with the release of cytokines Discuss
- 3. The influenza vaccine is administered each year because
Options- A. mutations in the viral hemagglutinin may allow the virus to evade the immune response elicited by previous vaccines
- B. it is a polysaccharide vaccine that does not confer long-term protection
- C. the vaccine is sufficiently toxic to make it necessary to administer only a small amount at any one time
- D. none of the above Discuss
- 4. Which is not a major defense mechanism in the stomach?
Options- A. Proteolytic enzymes
- B. Low pH
- C. Dense normal flora
- D. All of these Discuss
- 5. Which of the following is true regarding anthrax?
Options- A. Anthrax is caused by a virus
- B. Anthrax is highly contagious
- C. Inhalation anthrax and cutaneous anthrax are caused by separate strains of Bacillus anthracis
- D. Inhalation Anthrax requires infection with a large number of spores Discuss
- 6. Which of the following(s) show(s) positive results for phenylalanine deaminase test?
Options- A. Providencia
- B. Proteus
- C. Morganella
- D. All of these Discuss
- 7. The gram-negative organisms is
Options- A. Actinomyces
- B. Bacillus
- C. Clostridium
- D. None of these Discuss
- 8. The primary stain of Gram's method is
Options- A. safranin
- B. phenolpthalene
- C. crystal violet
- D. methyl red Discuss
- 9. Which of the following(s) is/ are oxidase-positive bacteria?
Options- A. Vibrio
- B. Neisseria
- C. Pseudomonas
- D. All of these Discuss
- 10. Which of the following shows a positive urease test?
Options- A. Proteus
- B. Klebsiella
- C. Both (a) and (b)
- D. None of these Discuss
Identification of Bacteria problems
Search Results
Correct Answer: ADP ribosylation of a G protein that locks it into an active form that stimulates adenylate cyclase to make cAMP
Correct Answer: cause ADP ribosylation of a factor involved in protein synthesis
Correct Answer: mutations in the viral hemagglutinin may allow the virus to evade the immune response elicited by previous vaccines
Correct Answer: Dense normal flora
Correct Answer: Inhalation Anthrax requires infection with a large number of spores
Correct Answer: All of these
Correct Answer: None of these
Correct Answer: crystal violet
Correct Answer: All of these
Correct Answer: Both (a) and (b)
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